/*
 * Copyright 2012-2025 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.assertj.core.internal;

import static java.util.stream.Collectors.toList;
import static java.util.stream.IntStream.range;
import static org.assertj.core.internal.Iterables.byPassingAssertions;
import static org.assertj.core.util.Streams.stream;

import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;

/**
 * Wrapper for the list of elements that satisfy certain requirements (expressed as a <code>Consumer</code>).
 *
 * @author Michael Grafl
 *
 * @param <E> element type
 */
class ElementsSatisfyingConsumer<E> {

  private final List<E> elements;

  ElementsSatisfyingConsumer(Iterable<? extends E> actual, Consumer<? super E> assertions) {
    this(filterByPassingAssertions(actual, assertions));
  }

  private static <E> List<E> filterByPassingAssertions(Iterable<? extends E> actual, Consumer<? super E> assertions) {
    return stream(actual).filter(byPassingAssertions(assertions)).collect(toList());
  }

  private ElementsSatisfyingConsumer(List<E> elements) {
    this.elements = elements;
  }

  List<E> getElements() {
    return elements;
  }

  /**
   * New <code>ElementsSatisfyingConsumer</code> containing all elements except the first occurrence of the given element.
   *
   * <p> This instance is not modified.
   *
   * @param element the element to remove from the result
   * @return all except the given element
   */
  ElementsSatisfyingConsumer<E> withoutElement(E element) {
    ArrayList<E> listWithoutElement = new ArrayList<>(elements);
    removeFirstReference(element, listWithoutElement);
    return new ElementsSatisfyingConsumer<>(listWithoutElement);
  }

  private static void removeFirstReference(Object element, List<?> elements) {
    range(0, elements.size()).filter(i -> elements.get(i) == element)
                             .findFirst()
                             .ifPresent(elements::remove);
  }

}
